Carbon-holder of electric-arc lamps.



W. L. HUMPHRIES.

CARBON HOLDER 0F ELECTRIC ARC LAMPS.

APPLICATION FILED JAN.19. 1918.

1 278, 66 a I Patented Sept. 10, 1918.

W TTED STATEE PATENT WILLIAM LESLIE HUMII-IRIES, 0F PATRICROFT, NEAR TJIANCHE$TER, ENGLAND, ASSiIZCiNOR 0F ONE-FOURTH TO ERNEST MILTON PEMBERTON, ONE-FOURTH T0 JOHN' WILLIAM HINCHCLIFFE, AND ONE-FOURTH. TO TOM BYROM, ALL OF MANCHESTER, ENGLAND.

CARBON-HOLDER OF ELECTRIC-ARC LAMPS.

Application filed. January 19, 1918..

To all whom it may. concern:

Be it known that 1, WILLIAM Lnsmn HnMrrLmns, a subject of the King of Great Britain and Ireland, and resident of Patricroft, near Manchester, England, have invented certain new and useful Imp-rovements in or Relating to the Carbon-Holders of Electric-Arc Lamps, of which the following is a specification.

This invention relates to electric arc lamps as used' in cinematograph lanterns, search lights and the like, in which the carbons are clamped by a loopat the end of a spindle, which draws the carbon against a. relatively fixed crossbar- With such arrangement an inch or two of each carbon isv usually Wasted owing tothe fact that the carbon requires to be renewed before it is fully consumed, to avoid the heat injnriousl-y affecting the clamp and the object of the present inventionis toprovidev carbon holders, in combination with such clamps so that the carbon is effectively held near the end while the clamp supports the holder and clamps:

the same upon the carbon.

According to the invention, atnbular carbon holder is provided which is divided longitudinally, and the parts of which are adapted to separate to admit the carbon, and come together again to clamp the carbon, the holder being so formed that the carbon can be clamped with only a very small portion extending in the holder; The holder is made to fit the usual clamping loop of the lamp frame, and be thereby adapted by one adjustment of the cla1np-tobe-secured in position to the lamp frame, as well as clamp the carbon.

To prevent the parts of the holders when released by the clamp falling down or out of the clamp, means are provided whereby they are supported bythe clamp even while unclamped.

The invention will be more particularly described by the aid of the accompanying drawings, in reference to cinematograph projecting apparatus in which:

Figure 1 is a side elevation of a pair of the improved holders applied to the usual carbon supporting frame.

Specification of Letters Patent.

Patented Sept. 10,1915.

SerialNo. 212,682.

Fig. 2 is an enlarged side elevationlpartly sectional) of the top carbon holder removed from the frame.

Fig. 8 is an inverted plan view of Fig. 2.

Fig. l is a part sectional elevation of the bottom carbon holder removed from the frame.

Fig. 5 is a view corresponding to Fig. 3 showing a modified form of opening in the holder adapted to receive carbons of varying diameters.

Figs. 6 and 'Zshow modified forms of the carbon holders hereinafter described.

Referring to the drawings, the top holder a is cylindrical in shape and has an enlarged part a atone end recessed or bored at a to receive the carbon.

The holder is divided longitudinally from the enlarged end to; a point near the top where a transverse slot (1 is formed whichdivides the two halves of the holder in a manner such that the reduced portion of one half is longer than the reduced portion of the other half, and hookwise engages the end thereof, as will be clearly seen from the drawings. A small pin 6'' is securedto one of' the halves of the stem for it to rest on when between the clamps c, and thus support the same when the clamps are opened, the other half of the carbon holder being sup ported by the beforennentioned hook-wise interenga-ging part.

The said clamps each comprise as usual a spindle (Z having a loop 03' through which the stem of the holder passes, and also a pair of cross bars 6, f held apart by stays g and through which the spindle d projects, the loop part, on the spindle being tightened up, clamping the holder firmly against the cross bar e.

The spindle is usually provided with a knurled nut or wheel h for adjusting the clamp, which, as shown, is situated at a distance from the carbons.

Upon slacking off the clamps the parts of the upper holder are made free to separate, but while free they are prevented falling through the eye of the spindle by means of the pin 6. After inserting a fresh carbon in the holder, the spindle d is tightened up,

thereby clamping the holder to the cross bar 6 and also clamping the parts of the holder on to the carbon. 7

The lower carbon holder 6 is divided longitudinally for its entire length, and its parts are prevented falling through the loop cl by having a shoulder adapted to'rest upon the edge of the crossbar e, or upon the eye of the spindle d. A pin 6 may, however be used if desired. The carbons are usually round. In order that the same holder or. and Z2 may be used with carbons of different sizes,

the carbon recesses a 6 may be formed of a diameter equal to the diameter of the smallest carbons it is intended to use but with the side of the recess in each half holder adjacent to the joint, beveled off as shown in Fig. 5. Alternatively, split or other liners may be used to vary the diameter of the gripping portion.

Fig. 6 illustrates a form of the invention in which the two halves of a holder a* are interconnected by a pin secured to one half, and passing through a hole in the other half, said hole being a somewhat loose fit to allow the required opening movement to take place. In this case the pin 7) also serves to support the holder in the clamp when the latter is slackened back for renewal or adjustment purposes.

In some cases where it is desired to use long lengths of carbon and gradually feed the same through the holder through openings may be formed in the holders. Such an arrangement is illustrated in Fig. 7 where the holder or is of uniform diameter, both internally and externally throughout its length, said holder, when in the clamp, resting upon pins i and j, secured respectively to each halfof the holder.

It will now be seen that in each example of-the invention, the carbons can be held with the minimum amount extending into the holder, and the carbon can be practically fully used up without the heat injuriously affecting the clamp, further, that the carbons can be readily renewed without requiring to wait until the parts have cooled down, and when clamped by the holders, good electrical contact is maintained between the holders and the carbons.

l/Vhat I claim is:

1. Carbon holders adapted to be carried by the clamps of electric arc lamps comprising a cylindrical member bored to receive the carbon and divided longitudinally into two main parts, one of said parts being provided with a peg projecting at right angles to the axis of the holder and adapted to enter a hole in the other part, together with means to support the holder when in the clamp, substantially as described.

2. Carbon holders adapted to be carried in the clamps of electric arc lamps comprising a cylindrical member bored to receive the carbon and divided longitudinally into two main parts, one of said parts being provided with a peg projecting at right angles to the axis of the holder and adapted to enter a hole in the other part, said peg protruding horizontally and also serving to support the holder when in the clamp, substantially as described.

8. Carbon holders adapted to be carried by the clamps of electric arc lamps comprising a cylindrical member bored to receive the carbon and divided longitudinally into two main parts, one of said parts being provided with a peg projecting at right angles to the axis of the holder and adapted to enter a hole in the other part, the end of the cylindrical portion adapted to enter the clamp being of less diameter than the end which-is bored to receive the carbon, sub stantially as described.

4. Carbon holders adapted to be carried by the clamps of electric arc lamps comprising a cylindrical member which is divided longitudinally and which is bored to receive the carbon, the sides of said boring being beveled oil to accommodate carbons of difierent size, means being provided to support the integral parts of the holder when in the clamp, substantially as de scribed.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

WILLIAM LESLIE HUMIHRIES.

Witnesses:

HENRY J UNCA, FRED J. MEREDITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

